PLATE 8 



Bivularia atra var. hcmispliaerica (Kuetz.) B. and F. 



Fig. 1. Diagrammatic section of thallus perpendicular to the base showing 

 the radiating filaments and concentric zones. X 5. 



Fig. 2. Portion of radial section of thallus, somewhat diagrammatic. X 20. 



Arthrospira maxima S. and G. 



Fig. 3. An entire mature plant. Reprinted from Gardner, Univ. Calif. Publ. 

 Bot., vol. 6, p. 412, pi. 33, fig. 3, 1917. 



Calothrix pilosa Harvey 

 Fif. 4. A small group of filaments showing the position of heterocysts and 

 some of the methods of false branching. Semidiagiammatic. 



Dermocarpa fuoicola Saunders 



Fig. 5. Diagram of host plant, showing the position and distribution of the 

 epiphyte. 



Fig. 6. Section through a pustule showing the shapes of the vegetative cells 

 and one gonidangium. X 1400. 



Merismopedia Gardneri (Collins) Setchell 

 Fig. 7. Surface view of a portion of the thallus. X 350. 



Anabaena variabilis Kuetz. 



Fig. 8. Two portions of plants, showing typical vegetative cells, heterocysts 

 and mature spores. X 360. 



Aiiabaena propinqua S. and G. 

 Fig. 9. A group of plants showing typical vegetative cells, heterocysts, and 

 mature spores. X 400. Reprinted from Gardner, Univ. Calif. Publ. Bot., vol. 6, 

 p. 496, pi. 42, fig. 1, 1919. 



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